1. Nothing in this section or section 105.1209 shall be construed to affect or limit any state agency’s authority regarding professional registration, licensing or issuance of professional certificates, nor shall this section be construed to limit or affect the authority of the state board of education to examine applicants and issue high school equivalency certificates.

2. The school board of each school district shall establish a written policy on student participation in statewide assessments. The policy shall be provided to each student and the parent, guardian or other person responsible for every student under eighteen years of age at the beginning of each school year and a copy of the policy shall be maintained in the district office and shall be available for viewing by the public during business hours of the district office. A school board may establish a policy designed to encourage students to give their best efforts on each portion of any statewide assessment established pursuant to section 160.518 which may include but is not limited to incentives or supplementary work as a consequence of performance.

3. In no case shall the state board of education or any other state agency establish any single test or group of tests as a condition or requirement for high school graduation or as a requirement for a state-approved diploma.